Perhaps you should try some spelling variations:
wang thanh » long thanh, van thanh
wang wang » wang yang, wang liang, wang yan
yang john » young john, king john, yang jin
kong sara » kong sar
thanh vu » thanh van, thanh _
vu irene » _ irene
wong sam » wong sau, wong lai, kong sar

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: wang wang thanh vu irene yang john ((wong sam) or (kong sara)) ;~.
• If you are trying to use Boolean operators, they must be ALL CAPS: wang wang thanh vu irene yang john ((wong sam) OR (kong sara)) ;.
• Adding a wildcard symbol may retrieve word variants: wang wang thanh vu irene yang john ((wong sam) or (kong sara)) ;*.